Reception changes when making a call?

Discussion in 'iPhone' started by jshtroutman, Nov 11, 2016.

  1. jshtroutman macrumors regular

    jshtroutman

    Joined:
    Sep 9, 2016
    #1
    Hey guys I was just hoping someone with more knowledge on the subject could chime in on what's happening. I have a launch day IPhone 7 with T-Mobile service. At my home I have noticed my phone on average has 2 dots of reception when on standby and normal internet surfing. However when making a call my service jumps to 4 to 5 dots every time. Having two dots still gives me great LTE speeds so it isn't a problem. What's causing this? Is my phone throwing less juice to my antenna when it's not nessary for full power reception?
     
  2. willmtaylor macrumors G3

    willmtaylor

    Joined:
    Oct 31, 2009
    Location:
    A Natural State
    #2
    1. Enable "field test mode" for true measurements instead of "dots."

    2. Perhaps it's not related to the call, but how you're holding the phone.
    • Is the same behavior exhibited when holding it to your ear but not actually on a call?
    • What if on a call using speakerphone?
     
  3. C DM macrumors Westmere

    Joined:
    Oct 17, 2011
    #3
    When you are calling, is it using Wi-Fi calling, VoLTE, just regular voice?
     
  4. deeddawg macrumors 604

    Joined:
    Jun 14, 2010
    Location:
    US
    #4
    Old info but possibly still relevant...

    What you see when idle is whatever channel & frequency band the phone is using to keep in touch with the network, typically at whatever was best when the the link to that particular tower began and not re-negotiated unless necessary.

    Once you establish a call, the tower and phone may renegotiate which channel & frequency band has the least congestion and best signal at *that* moment.
     
  5. jshtroutman thread starter macrumors regular

    jshtroutman

    Joined:
    Sep 9, 2016
    #5
    It does the same thing when on speaker also.
    It's using regular voice I think. Sometimes I can see three little letters for a brief second when I end the call. I think the first letter is G.
    That would make since. It done the exact same thing with my GS7 Edge before I got the 7.
     
  6. C DM macrumors Westmere

    Joined:
    Oct 17, 2011
    #6
    It sounds like you are using a different network when you are calling, not LTE, so when you are in a call it's showing the signal for that network, and then outside of the call it's showing the LTR signal, both of which can be of different strengths and quality and thus different dots/bars.
     
  7. Channan macrumors 68030

    Channan

    Joined:
    Mar 7, 2012
    Location:
    New Orleans
    #7
    Do you switch from LTE to 4G when you make a call?
     
  8. spooned12000rpm macrumors regular

    Joined:
    Jun 4, 2009
    Location:
    York, UK
    #8
    Yeah, I've noticed this behaviour for years, generally at work I get 2-3 dots with a 4G signal, if I make a call then the data network will drop to 3G or E with 4-5 dots of signal. I remember reading somewhere that said this is normal and is also linked to the fact that data usage is interrupted during a call (like the phone is programmed to put all its effort into maintaining a decent call signal).
     

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